EP1976743A2 - Dispositif reduisant la trainee due au deplacement relatif d'un corps et d'un fluide - Google Patents
Dispositif reduisant la trainee due au deplacement relatif d'un corps et d'un fluideInfo
- Publication number
- EP1976743A2 EP1976743A2 EP06831645A EP06831645A EP1976743A2 EP 1976743 A2 EP1976743 A2 EP 1976743A2 EP 06831645 A EP06831645 A EP 06831645A EP 06831645 A EP06831645 A EP 06831645A EP 1976743 A2 EP1976743 A2 EP 1976743A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- groove
- contact
- drag
- recirculation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D37/00—Stabilising vehicle bodies without controlling suspension arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
- B63B1/06—Shape of fore part
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C21/00—Influencing air flow over aircraft surfaces by affecting boundary layer flow
- B64C21/02—Influencing air flow over aircraft surfaces by affecting boundary layer flow by use of slot, ducts, porous areas or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C21/00—Influencing air flow over aircraft surfaces by affecting boundary layer flow
- B64C21/10—Influencing air flow over aircraft surfaces by affecting boundary layer flow using other surface properties, e.g. roughness
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/02—Influencing flow of fluids in pipes or conduits
- F15D1/06—Influencing flow of fluids in pipes or conduits by influencing the boundary layer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/10—Influencing flow of fluids around bodies of solid material
- F15D1/12—Influencing flow of fluids around bodies of solid material by influencing the boundary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C2230/00—Boundary layer controls
- B64C2230/08—Boundary layer controls by influencing fluid flow by means of surface cavities, i.e. net fluid flow is null
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C2230/00—Boundary layer controls
- B64C2230/20—Boundary layer controls by passively inducing fluid flow, e.g. by means of a pressure difference between both ends of a slot or duct
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C2230/00—Boundary layer controls
- B64C2230/24—Boundary layer controls by using passive resonance cavities, e.g. without transducers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/10—Drag reduction
Definitions
- This turbulent flow creates vortices of the fluid around or along the body whose direction of rotation is such that the layer of fluid in contact with or near the body has a displacement component directed in the opposite direction of the movement of the body, respectively in the direction of fluid flow.
- the object of the present invention is to provide means for creating and controlling the direction of rotation of the vortices due to the turbulent flow of a fluid around or in a body so as to reduce the friction forces between at least one part. of the body surface and the fluid, thereby reducing drag, stress and pressure drop.
- the device according to the invention makes it possible to reduce the stresses due to the flow of the fluids to which they are subjected and therefore to reduce their fatigue and their wear.
- the device according to the invention reducing the drag due to the movement of a body in a fluid, reducing the stresses to which a fixed body is subjected or reducing the pressure losses due to the flow of a fluid in a pipe, obviates the aforementioned drawbacks and makes it possible to achieve the aim stated above and is distinguished by the characteristics listed in claim 1.
- the accompanying drawing illustrates on the one hand the phenomenon of turbulent flow around a body as it occurs naturally and on the other hand as it occurs around or in a body equipped with the device according to the invention.
- Figure 1 schematically illustrates the turbulent flow around a body moved in a fluid, or a fluid moving around a body.
- FIG. 2 schematically illustrates a body equipped with the device according to the invention and the modified flow which results therefrom.
- FIG. 3 illustrates a body provided with a variant of the means according to the invention.
- FIGS. 4 to 7 illustrate by way of non-exhaustive examples different forms that the means according to the invention can take.
- FIG. 8 illustrates a flexible, self-adhesive profile, provided with the means according to the invention.
- FIG. 9 illustrates a train equipped with the device according to the invention.
- Figures 10 and 11 illustrate a bridge seen from the side and from above partially in section along line A - A provided with the device according to the invention.
- FIG. 12 is a diagram of a warhead provided with a drag reduction device on which tests have been carried out.
- FIG. 13 partially illustrates a warhead on which a device according to FIG. 7 has been affixed and which has served as a basis for efficiency tests.
- FIG. 14 partially illustrates a warhead in which a device according to FIG. 7 has been provided, embedded in the warhead, which has served as a basis for efficiency tests.
- FIG. 15 illustrates a tube fitted with the embedded device.
- FIG. 16 illustrates a tube fitted with the attached device.
- Figure 17 illustrates the recirculation phenomenon obtained by the device.
- FIG. 1 schematically when a body moves in a fluid, or when a fluid flows around this body, when the relative speed between the body and the fluid increases a regime is established
- FIG. 2 illustrates a body 1 provided with means 2 making it possible to control and channel in particular the direction of rotation of the vortices of the turbulent flow around the body.
- these means 2 are formed by a groove extending over the entire immersed surface of the body 1 in the fluid and extending from preferably substantially perpendicular to the fluid flow.
- This groove 2 has a shape such that the threads of fluid in contact with at least part of the surface of the body 1 arriving at the location of this groove penetrate into it and cause a direction of rotation like threads of fluid in contact with the body downstream of the device that they have a relative speed with respect to the body 1 directed in the direction of movement of this body, that is to say opposite to
- the device according to the invention comprising the groove 2 made it possible to reverse the direction of rotation of the vortices and thus reduce the friction drag over a certain distance at least downstream of the groove 2.
- the position of the groove 2 relative to the body 1 may vary in particular as a function of the shape of the body 1, but this groove 2 is preferably located at a location on the body located upstream from the place where the turbulence of the boundary layer.
- Several grooves 2 can be arranged one behind the other along the body at different locations thereof.
- this groove 2 can be closed on itself since the body is totally immersed in the air.
- the groove 2 may be provided on the hull only in its submerged part.
- a groove 2 can also be made in this bulb over its entire periphery.
- the body 1 is provided with a first member selected from the group consisting of a first and a second member selected from the group consisting of a first and a second member selected from the group consisting of a first and a second member selected from the group consisting of a first and a second member selected from the group consisting of a first and a second member selected from the group consisting of a first and a second member selected from the group consisting of a first and a prefferably a f
- protuberance 3 comprising the groove 2.
- This protuberance may have come in one piece with the body or be formed by a profile fixed to the body 1.
- a zone 5 on the front part of the bulb 1 is covered with a cap of quasi-stationary fluid.
- the shape of the groove 2 can vary according to the embodiments as illustrated, by way of example, diagrammatically in FIGS. 4 to 7.
- the variant illustrated in Figure 4 has a substantially symmetrical groove and whose free edges 2a, 2b are located in the extension of Ia surface 4 of the body moving in the fluid.
- the groove extends over more than 180 ° and its free edges 2a, 2b are separated from each other by a distance less than the maximum width of the groove 2.
- the groove 2 has the general shape of a U.
- the groove 2 is asymmetrical in the sense that one of its free edges 2a, 2b is offset relative to the external envelope of the body immersed in the fluid, which in certain cases facilitates
- the groove 2 has the general shape of a C.
- FIG. 8 illustrates a profile 6 comprising a lower face 6a which can be provided with an adhesive layer protected by a removable sheet.
- This profile has thin and tapered edges 6b, 6c and a thick central part in which the groove 2 is formed.
- This embodiment of the drag reduction device is practical and easy to implement because it does not require change the shape of the body surface on contact with a fluid. Indeed, it suffices to cut a length of the profile 6 corresponding to the periphery of the body or of the portion of the body to be provided with the drag reduction device and then to glue this length of profile on the surface of the body, according to the layout. desired, generally perpendicular to the flow of the fluid, to provide the body with said drag reduction device formed by the groove 2.
- the device described makes it possible to control, regulate and standardize the flow of the fluid whose speed and pressure become more stable.
- the result obtained using the device according to the invention is a significant reduction in the drag to which a body moving in a fluid is subjected.
- Such a result is very important for all vehicles moving in a fluid, boats, trains, cars, planes etc. since the reduction in drag, in particular in friction drag automatically results in a reduction in the energy required for propulsion, therefore a reduction in fuel consumption or an increase in the speed of movement of the vehicle.
- the presence of the device on a moving body in a fluid can cause, as illustrated in FIG. 2, the formation of a stable fluid film 5 in the form of a cap on the front of the body 1, which also reduces the drag.
- FIG. 9 illustrates a land vehicle equipped with two devices 2 according to the invention one behind the other separated by a certain distance.
- the distance separating two devices along the vehicle is preferably less than the distance where the boundary layer is formed downstream of the first device.
- the device according to the invention makes it possible to reduce the stresses to which they are subjected and therefore their fatigue and / or wear.
- the piers P of the bridge are each provided with several grooves 2 having the general shape of a C as illustrated in FIGS. 4 to 7 extending along one or more generatrices of the stack.
- the deck T of the bridge is provided with one or more grooves 2 having the general shape of a C. These grooves in the general shape of C 2 stabilize and control the flow of water or air circulating around the piers P and the deck T of the bridge and ensure that these elements are subjected to less stress and effort for a given speed. flow of water and / or air around them.
- the drag reduction device causes a significant reduction in the friction drag and in the total drag, resulting from the reversal of the direction of rotation of the vortices created around the body immersed in the fluid, which reduces the relative speed of movement between the object and the fluid stream.
- FIG. 13 In a first configuration (FIG. 13) such a warhead was provided with a type of drag reduction device according to FIG. 8, that is to say a device 2 incorporated in an element 6 fixed against the outer wall. of the warhead. This device was placed at about 2.6m. from the point of the warhead, that is to say at a distance of approximately 4.4m from the maximum section of the warhead.
- Figure 13 partially illustrates the warhead provided with this device in cross section. The diameter of the groove 2 is in this case of the order of 2.5 cm.
- the device was placed in the same place of the warhead as in the previous example, but the diameter of the groove 2 was increased to 5 cm and the latter had a shape of the type illustrated in FIG. 7
- the measures noted are:
- the size of the groove 2, its shape, its position relative to the body immersed in a fluid can modify its effectiveness in reducing drag.
- the drag reduction device according to the invention can also be used to reduce the pressure drop and the cavitation of the flow of a flow of fluid inside a tube. This can be important in many areas such as penstocks, fluid distribution networks, engine intake or exhaust manifolds, pipelines, etc.
- FIG. 15 schematically illustrates in section the use of a drag reduction device, embedded or machined in the wall of a tube.
- FIG. 16 schematically illustrates in section the use of a drag reduction device attached to the internal wall of a tube.
- FIG. 17 illustrates a portion of a submerged body moving in water comprising the drag reduction device and illustrating the water recirculations induced by this device.
- the groove 2 is applied or embedded in the internal wall of the tubing and is preferably closed on itself, that is to say continuous since the fluid is in contact with the entire internal surface of the tubing.
- a first recirculation I is observed downstream of the groove 2.
- the upper layer, distant from the body 1, of this first recirculation flows in the direction of the general flow of the fluid around the body while the lower layer, in contact of the body 1, this first recirculation I takes place in the opposite direction to the general flow of the fluid so that the friction between the body 1 and the fluid in this recirculation zone is reduced.
- the two recirculations are in contact with each other and must therefore have the same direction of rotation, which imposes the direction of rotation of the second recirculation II, that which is performs in groove 2 and which is therefore contrary to the direction of rotation of the second
- an edge A is created at the downstream edge of the groove 2.
- the device that is to say the groove 2 and possibly the stop A influence the boundary layer of the fluid flowing around the body 1. Under these conditions, the dimensions of these elements 2 and A are always weak or even very weak compared to those of body 1, for example a few centimeters while those of body 1 are of the order of 20m to 200m.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Transportation (AREA)
- Hydraulic Turbines (AREA)
- Manipulator (AREA)
- Semiconductor Integrated Circuits (AREA)
- Apparatuses And Processes For Manufacturing Resistors (AREA)
- Bridges Or Land Bridges (AREA)
- Massaging Devices (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- Percussion Or Vibration Massage (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH19282005 | 2005-12-06 | ||
PCT/IB2006/003474 WO2007066199A2 (fr) | 2005-12-06 | 2006-12-05 | Dispositif reduisant la trainee due au deplacement relatif d'un corps et d'un fluide |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1976743A2 true EP1976743A2 (fr) | 2008-10-08 |
EP1976743B1 EP1976743B1 (fr) | 2010-05-05 |
Family
ID=37944226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06831645A Not-in-force EP1976743B1 (fr) | 2005-12-06 | 2006-12-05 | Dispositif reduisant la trainee due au deplacement relatif d'un corps et d'un fluide |
Country Status (10)
Country | Link |
---|---|
US (1) | US20080272241A1 (fr) |
EP (1) | EP1976743B1 (fr) |
KR (1) | KR20080081915A (fr) |
CN (1) | CN101374717A (fr) |
AT (1) | ATE466759T1 (fr) |
BR (1) | BRPI0619469A2 (fr) |
CA (1) | CA2670268A1 (fr) |
DE (1) | DE602006014210D1 (fr) |
RU (1) | RU2008127249A (fr) |
WO (1) | WO2007066199A2 (fr) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7810867B2 (en) * | 2008-04-14 | 2010-10-12 | Fastskinz, Inc. | Vehicle with drag-reducing outer surface |
US8870124B2 (en) * | 2009-07-10 | 2014-10-28 | Peter Ireland | Application of elastomeric vortex generators |
US8436284B1 (en) * | 2009-11-21 | 2013-05-07 | The Boeing Company | Cavity flow shock oscillation damping mechanism |
CH702593A2 (de) * | 2010-01-28 | 2011-07-29 | Marco Feusi | Körper mit einer Oberflächenstruktur zur Verringerung eines Strömungswiderstands des Körpers in einem Fluid. |
US8662854B1 (en) | 2010-05-21 | 2014-03-04 | Fastskinz, Inc. | Turbine with turbulence inducing surface |
CN102322462A (zh) * | 2011-05-02 | 2012-01-18 | 李仕清 | 一种高效增程技术 |
GB201114433D0 (en) * | 2011-08-22 | 2011-10-05 | Airbus Operations Ltd | Wing leading edge venting |
CN103307935A (zh) * | 2012-03-16 | 2013-09-18 | 徐际长 | 火箭外壳增速袋 |
CN103376031A (zh) * | 2012-04-23 | 2013-10-30 | 徐际长 | 鱼雷外壳增速袋 |
CN102777450A (zh) * | 2012-07-26 | 2012-11-14 | 上海交通大学 | 新型高速表面减阻结构 |
CN103129572A (zh) * | 2013-03-04 | 2013-06-05 | 唐山轨道客车有限责任公司 | 动车组车体和动车组 |
KR20150044754A (ko) * | 2013-10-17 | 2015-04-27 | 선문대학교 산학협력단 | 사보니우스 터빈용 블레이드 버킷 구조체 |
US9979079B2 (en) | 2015-02-23 | 2018-05-22 | Quintel Technology Limited | Apparatus and method to reduce wind load effects on base station antennas |
CN105292441A (zh) * | 2015-07-11 | 2016-02-03 | 郝文朴 | 扰动降阻 |
DE102016012368A1 (de) * | 2016-10-15 | 2018-04-19 | Karsten Wysocki | Vorrichtung zur Minimierung des Reibungwiderstandes bei Wasserfahrzeugen |
CN108167282B (zh) * | 2017-12-22 | 2020-03-10 | 南京航空航天大学 | 一种减少摩擦阻力的装置及利用其减小流体粘滞摩擦阻力的方法 |
JP7446970B2 (ja) | 2020-10-02 | 2024-03-11 | 東海旅客鉄道株式会社 | 電力変換装置取付構造及び鉄道車両 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2899150A (en) * | 1959-08-11 | Bound vortex skin | ||
GB729880A (en) * | 1952-08-19 | 1955-05-11 | Miag Muehlenbau & Ind Gmbh | Pneumatic conveyor pipe line |
US3774867A (en) * | 1972-06-27 | 1973-11-27 | Us Air Force | Acoustic wing stall delaying device |
US4706910A (en) * | 1984-12-27 | 1987-11-17 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Combined riblet and lebu drag reduction system |
US4741498A (en) * | 1986-09-11 | 1988-05-03 | Northrop Corporation | Ultrasonic drag reduction and lift increase |
US5255881A (en) * | 1992-03-25 | 1993-10-26 | Vigyan, Inc. | Lift augmentation for highly swept wing aircraft |
JP2000199505A (ja) * | 1999-01-07 | 2000-07-18 | Funagata Kagaku Kenkyusho:Kk | 物体の流体摩擦抵抗低減装置 |
JP2001050215A (ja) * | 1999-08-11 | 2001-02-23 | 浩伸 ▲黒▼川 | カルマン渦低減体 |
DE10012905A1 (de) * | 2000-03-16 | 2001-09-20 | Anton Lechner | Dachträger für Fahrzeuge |
US6796533B2 (en) * | 2001-03-26 | 2004-09-28 | Auburn University | Method and apparatus for boundary layer reattachment using piezoelectric synthetic jet actuators |
ITRM20010501A1 (it) * | 2001-08-10 | 2003-02-10 | Univ Roma | Corpo aerodinamico provvisto di cavita' superficiali. |
US7823839B2 (en) * | 2005-10-31 | 2010-11-02 | Georgia Tech Research Corporation | Airfoil performance modification using synthetic jet actuators |
-
2006
- 2006-12-05 US US12/095,929 patent/US20080272241A1/en not_active Abandoned
- 2006-12-05 CA CA002670268A patent/CA2670268A1/fr not_active Abandoned
- 2006-12-05 EP EP06831645A patent/EP1976743B1/fr not_active Not-in-force
- 2006-12-05 DE DE602006014210T patent/DE602006014210D1/de active Active
- 2006-12-05 KR KR1020087013696A patent/KR20080081915A/ko not_active Application Discontinuation
- 2006-12-05 RU RU2008127249/11A patent/RU2008127249A/ru not_active Application Discontinuation
- 2006-12-05 AT AT06831645T patent/ATE466759T1/de not_active IP Right Cessation
- 2006-12-05 BR BRPI0619469-9A patent/BRPI0619469A2/pt not_active IP Right Cessation
- 2006-12-05 CN CNA2006800457650A patent/CN101374717A/zh active Pending
- 2006-12-05 WO PCT/IB2006/003474 patent/WO2007066199A2/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007066199A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE602006014210D1 (de) | 2010-06-17 |
CN101374717A (zh) | 2009-02-25 |
EP1976743B1 (fr) | 2010-05-05 |
BRPI0619469A2 (pt) | 2011-10-04 |
US20080272241A1 (en) | 2008-11-06 |
WO2007066199A2 (fr) | 2007-06-14 |
CA2670268A1 (fr) | 2007-06-14 |
RU2008127249A (ru) | 2010-01-20 |
WO2007066199A3 (fr) | 2008-08-14 |
KR20080081915A (ko) | 2008-09-10 |
ATE466759T1 (de) | 2010-05-15 |
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Legal Events
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